公开(公告)号：US20250137417A1

公开(公告)日：2025-05-01

申请号：US18495690

申请日：2023-10-26

Applicant: Cummins Inc.

Inventor： Shailesh Nair ,  Mayur H. Borate ,  Srinivas Kumar Mulukutla ,  Panendra Kumar Sahu ,  David Michael Carey

IPC: F02D41/38 ,  F02D1/06

Abstract: A pressure-based piston top-dead-center (“TDC”) position measurement system is disclosed, comprising: a fuel injector configured to inject fuel into a combustion chamber bounded in part by the piston; and a controller configured to control the fuel injector to cause a fuel injection when the piston is at each of a plurality of different positions relative to TDC while ensuring fuel is provided to the fuel injector at a substantially constant pressure. The controller is further configured to estimate a pressure in the combustion chamber in response to each fuel injection, fit a curve to the estimated pressures, and determine a TDC position of the piston as correlating with a maximum pressure on the curve.

公开(公告)号：US20240084768A1

公开(公告)日：2024-03-14

申请号：US18514250

申请日：2023-11-20

Applicant: Cummins Inc.

Inventor： Vivek Vasant Parab ,  Quereeta Ranjan ,  Panendra Kumar Sahu ,  Purva Sainath Rasal ,  Amol Jagannath Bobade

IPC: F02M51/06 ,  F02M61/16

CPC classification number: F02M51/0667 ,  F02M61/168

Abstract: Disclosed herein is an armature for a fuel injector. The fuel injector can have a longitudinal axis extending centrally therethrough. The armature can be configured to be positioned adjacent a gap in the fuel injector and configured to move along the longitudinal axis between first and second positions. In this regard, the armature can move in a proximal direction as the armature moves from the first position to the second position. Under these circumstances, fuel is forced out of the gap. The armature can move in the distal direction as the armature moves from the second position to the first position. Under these circumstances, fuel can be drawn into the gap. The armature can include a hydraulic separation feature configured to improve hydraulic separation of the armature such that a travel time between the first and second positions are reduced as the armature comes to rest. The hydraulic separation feature can include at least one of a modified mass, a modified overtravel diameter, and one or more diffusion holes.